Many of us think the GG-1 is a beautiful art deco engine. I think that its streamlining is equal to or better than any contemporary diesel or electric.
I remember riding behind GG-1s many times as a kid. It looked good with any train it was pulling including freights. Even PC black couldn't destroy its classic lines.
I believe that the reason the GG-1 is a popular with modelers as the SF War Bonnet F units is that both are true classics.
Joe